Instability of subdiffusive spin dynamics in strongly disordered Hubbard chain

Instability of subdiffusive spin dynamics in strongly disordered Hubbard chain
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强无序哈伯德链中次扩散自旋动力学的不稳定性

DOI:
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发表时间:
2019
期刊:
影响因子:
3.7
通讯作者:
M. Mierzejewski
M. Mierzejewski
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Środa;P. Prelovšek;M. Mierzejewski

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研究了具有强随机在位势和自旋相关跳跃积分的Hubbard链中的自旋输运。对于SU(2)对称情形,$t_{\uparrow} =t_{\downarrow}$,该模型只表现出部分多体局域化和(离域)亚扩散自旋激发.在这里,我们证明,即使是弱自旋--不对称性,$t_{\uparrow} \ne t_{\down arrow}$打破SU(2)对称性,也会局部化自旋并恢复完整的多体局部化。为此,我们导出了一个有效的自旋模型,其中自旋亚扩散被任意弱的t_{\uparrow} \ne t_{\downarrow}$破坏。自旋次扩散的不稳定性源于随机有效场和奇异分布的随机交换相互作用之间的相互作用。
We study spin transport in a Hubbard chain with strong, random, on--site potential and with spin--dependent hopping integrals, $t_{\sigma}$. For the the SU(2) symmetric case, $t_{\uparrow} =t_{\downarrow}$, such model exhibits only partial many-body localization with localized charge and (delocalized) subdiffusive spin excitations. Here, we demonstrate that breaking the SU(2) symmetry by even weak spin--asymmetry, $t_{\uparrow} \ne t_{\downarrow}$, localizes spins and restores full many-body localization. To this end we derive an effective spin model, where the spin subdiffusion is shown to be destroyed by arbitrarily weak $t_{\uparrow} \ne t_{\downarrow}$. Instability of the spin subdiffusion originates from an interplay between random effective fields and singularly distributed random exchange interactions.
DOI: 10.1209/0295-5075/119/37003
发表时间: 2017-08-01
期刊: EPL
影响因子: 1.8
作者:
Bar Lev, Yevgeny;Kennes, Dante M.;Karrasch, Christoph
通讯作者: Karrasch, Christoph
DOI: 10.1103/physrevb.98.064203
发表时间: 2018-08-14
期刊: PHYSICAL REVIEW B
影响因子: 3.7
作者:
Friedman, Aaron J.;Vasseur, Romain;Parameswaran, S. A.
通讯作者: Parameswaran, S. A.